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The refractive indices of the crown glass for blue and red light are 1.51 and 1.49 respectively and those of the flint glass are 1.77 and 1.73 respectively. An isosceles prism of angle 6⁰ is made of crown glass. A beam of white light is incident at a small angle on this prism. The other flint glass isosceles prism is combined with the crown glass prism such that there is no deviation of the incident light.
Calculate the net dispersion of the combined system.

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Important Questions on Ray Optics

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Physics>Optics>Ray Optics>Dispersion of Light

Which is the following colourful patterns is due to diffraction of light?

EASY

Physics>Optics>Ray Optics>Dispersion of Light

Which of the following colour suffers maximum deviation in a prism?

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Physics>Optics>Ray Optics>Dispersion of Light

The separation of a beam of light into its constituent wavelengths is called

HARD

Physics>Optics>Ray Optics>Dispersion of Light

The refractive index of a prism measured using three lines of a mercury vapour lamp. If

μ_{1}, μ_{2}

and

μ_{3}

are the measured refractive indices for these green, blue and yellow lines respectively, then

EASY

Physics>Optics>Ray Optics>Dispersion of Light

A ray is incident at an angle of incidence

i

on one surface of a small angle prism (with angle of prism

A

) and emerges normally from the opposite surface. If the refractive index of the material of the prism is

μ

, then the angle of incidence is nearly equal to:

EASY

Physics>Optics>Ray Optics>Dispersion of Light

If the refracting angle of a prism is

60 °

and minimum deviation is

30 °

, then the angle of incidence will be

EASY

Physics>Optics>Ray Optics>Dispersion of Light

In the given figure, what is the angle of prism?

Question Image

EASY

Physics>Optics>Ray Optics>Dispersion of Light

State any two differences between primary rainbow and secondary rainbow.

MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

The focal length of a thin convex lens for red and blue rays are

100 cm

and

96.8 cm

respectively. Then, the dispersive power of the material of the lens is

EASY

Physics>Optics>Ray Optics>Dispersion of Light

In which colour have maximum dispersion

EASY

Physics>Optics>Ray Optics>Dispersion of Light

The refractive index of water in a biology laboratory tank varies as

1.33 + \frac{(0.002)}{λ^{2}}

, where

λ

is the wavelength of light. Small pieces of organic matter of different colours are seen at the bottom of the tank using a travelling microscope. Then the image of the organic matter appears

MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

The angle of a prism is

60^{o}

. When light is incident at an angle of

60^{o}

on the prism, the angle of emergence is

40^{o}

. The angle of incidence

i

for which the light ray will deviate the least is such that

MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

A medium with refractive index $n (ω)$ , where $ω$ is the angular frequency, is said to possess anomalous dispersion when

EASY

Physics>Optics>Ray Optics>Dispersion of Light

Dispersion without deviation is produced by two thin (small angled) prisms which are combined together. One prism has angle

5 °

and refractive index

1.56 .

If the other prism has refractive index

1.7,

what is its angle?

EASY

Physics>Optics>Ray Optics>Dispersion of Light

The ratio of angular colour dispersion to the angle of deviation for the mean colour is known as _____.

MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

Which optical device can produce optical dispersion and which property is responsible for the dispersion of light? Draw a diagram to show that it is possible to obtain white light again after dispersion.

MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

The deviation produced for violet, yellow and red lights for crown glass are

3.75 °

3.25 °

and

2.86 °

respectively. Calculate the dispersive power of the crown glass.

EASY

Physics>Optics>Ray Optics>Dispersion of Light

A thin prism

P_{1}

with angle

4 °

and made from glass of refractive index

1.54

is combined with another thin prism

P_{2}

made from glass of refractive index

1.72

to produce dispersion without deviation. The angle of prism for

P_{2}

EASY

Physics>Optics>Ray Optics>Dispersion of Light

A thin prism having refracting angle

10^{o}

is made of glass of refractive index 1.42. This prism is combined with another thin prism made of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be

MEDIUM

Physics>Optics>Ray Optics>Dispersion of Light

It was found that the refractive index of material of a certain prism varied as

1.5 + \frac{0.004}{λ^{2}},

where

λ

is the wavelength of light used to measure the refractive index. The same material was then used to construct a thin prism of apex angle

10 °

. Angles of minimum deviation

(δ_{m})

of the prism were recorded for the sources with wavelengths

λ_{1}

and

λ_{2}

respectively. Then

Important Questions on Ray Optics

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